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INVESTMENTS
 6 Months Ended
Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
INVESTMENTS
INVESTMENTS
 
The following table summarizes, by major security type, the Company's short-term investments as of June 30, 2013 (in thousands): 
 
 
Cost
 
Gross 
Unrealized 
Gains
 
Gross 
Unrealized
 Losses
 
Fair
 Value
Available for sale securities
 
 

 
 

 
 

 
 

Foreign government securities
 
$
2,468,463

 
$
55

 
$
(612
)
 
$
2,467,906

U.S. government securities
 
1,713,374

 
255

 
(193
)
 
1,713,436

Corporate debt securities
 
1,518

 
—

 
—

 
1,518

Total
 
$
4,183,355

 
$
310

 
$
(805
)
 
$
4,182,860


 
As of June 30, 2013, foreign government securities included investments in debt securities issued by the governments of Germany, the Netherlands, and the United Kingdom. 
 
The following table summarizes, by major security type, the Company's short-term investments as of December 31, 2012 (in thousands): 
 
 
Cost
 
Gross
 Unrealized
 Gains
 
Gross
 Unrealized
 Losses
 
Fair
 Value
Available for sale securities
 
 

 
 

 
 

 
 

Foreign government securities
 
$
1,886,822

 
$
18

 
$
(287
)
 
$
1,886,553

U.S. government securities
 
1,759,773

 
520

 
(1
)
 
1,760,292

Total
 
$
3,646,595

 
$
538

 
$
(288
)
 
$
3,646,845


 

There were no realized gains or losses related to investments for the three and six months ended June 30, 2013 and 2012.